Please please please if you are already hesitating to have this child, abort.
As someone who has a “dad” (sperm donor?) similar to your partner, it would be much kinder to abort.
You have no idea the trauma that comes with knowing your dad is a rapist (and yes regardless of age kids are much more aware of what goes on behind closed doors than you think). It’s awful. Your kid might be forced to have contact with that individual for the rest of his/her life and carry that wound.
My mom had me at 17, had my brother at 18 and eventually left but she never managed to rebuilt what was broken. She is now 43 (soon) and had another kid at 41 with a guy she met at a club that couldn’t look any more disinterested in her if he tried (at least he doesn’t sound utterly abusive), but she is in love. I have lived abroad since I am 16 (to escape home) and I am in my mid 20’s now but everyone is very much aware of what happens in their bedroom as we can all very much hear when I do bother visiting.
Honestly it’s grim, growing up with a mom who doesn’t respect herself (and I am sorry OP but you don’t) is grim. If my mom gave me love or life advice, I would literally laugh at her because she doesn’t understand what love is. She obviously doesn’t love herself, doesn’t settle for men who love her and can’t know how to appropriately love her kids as a result.
Don’t bring a kid in this mess. My mom “couldn’t abort” (aka she made the choice not to as she couldn’t face it). Her body her choice yes, but it’s us, her kids who paid the high-price.
I have turned out okay (can’t say the same about my brother from the same father) but it’s not thanks to her. I will forever be resentful of the choice she made to keep me.
Being a mom is also knowing when a kid is better not being born. Having a piece of shit as a dad who rapes and emotionally abuse women is NOT the role model you want for your kids, it’s also not what your kid deserves to be brought into.
My advice to you: leave your partner IMMEDIATELY, and make a police report for rape, abort AND get effective contraception for the future and reach out to a professional therapist so you can learn about healthy relationships and navigate the abortion and your relationship with men.
Your older kids NEED you to value yourself and show them you know you deserve better and that you don’t ever want them to think it’s okay. My mom just trapped herself with a new baby, but you don’t have to.
Value yourself right now and leave your partner.